[TheForge] Packing and compression

[Chris Kilpatrick]

Yes, but it is growth over time, so you can edge pack and heat treat, just remember to keep your heat as low as possible and your soak time as short as possible.  alloying agents lengthen the time you can keep it at temp, but swift and low is the way to go.

-Chris K.

----- Original Message -----
From: "Jonathan Nedbor" <jonned at hvc.rr.com>
To: theforge at mailman.qth.net
Subject: [TheForge] Packing and compression
Date: Fri, 11 Nov 2005 10:58:31 -0500

> 
> I remember on a visit to a large forge shop where they made 
> bearings, among other things, that they were careful to move the 
> metal a certain amount in the last forging heat. This was we were 
> told, to assure a small grain size in the material as it relates to 
> the strength of the finished bearing.
> 
> I assume that these were not going to be heat treated because, in 
> my limited knowledge of this subject, when you heat above the 
> critical temp, also known as the heat of recrystallization, you get 
> just that - new crystal growth, and this is the temp that carbon 
> steel has to reach for heat treatment (ok Bill H. you can correct 
> me later). So all the "packing" in the world is not going to get a 
> harder edge if the grain you have compressed in the last forging 
> heat is regrown in the heat treat. Or something to that effect.
> 
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